This is something I’ve never seen before I think you have to add the numbers.
Answer: 
Step-by-step explanation:
Given:

To make
the subject of the formula means that we want to make
to stand alone , the first thing to do is to multiply through by 1/4a , that is

take the square of both sides:

Answer:
189-99=90 (What he needs left)
90/10= 9
so the answer is 9 weeks.
Parallel lines have the same slope...so if 1 line has a slope of 8, then a parallel line will also have a slope of 8
Answer:
20.4375 miles
Step-by-step explanation:
5 miles / 8 <u>km</u> * 32.7<u> km</u> = 20.4375 miles
( see how the units 'km' cancel out and you are left with 'miles' as your answer?)